Hi everyone. I want to buy a new graphics card to be able to play most games on high or better settings on my 1080p monitor. I currently have an AMD Radeon HD 6450 which came with the computer. I don't have a huge budget, so something cheap would be best. I'm not very knowledgeable in this area, so any help will be greatly appreciated. Thank you in advance.

the most powerful card that have the same power requirement than the 6450 is the 7750, going lower than that won't grant you a perceptible upgrade.
( well, the 6670 should also be good and much cheaper, but if your pc has a psu that is already near it's limit, considering that this card can consume up to 3 times more power, it's really hard to recommend blindly)
else: gt 430, gt 440 (630)

considering this article: http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107.html
if your current config is able to support the hd7750 and you plan to use 200$ for the whole upgrade, then once the psu bought you'll have enough money to get a 7770 which is just slightly faster and that won't be a great return for your money.

but if you want to spend 200$ alone on a gpu, then go for a 6870 or a gtx 560.

considering this article: http://www.tomshardw...eview,3107.html
if your current config is able to support the hd7750 and you plan to use 200$ for the whole upgrade, then once the psu bought you'll have enough money to get a 7770 which is just slightly faster and that won't be a great return for your money.

but if you want to spend 200$ alone on a gpu, then go for a 6870 or a gtx 560.

I've had a better experience NVidia cards, as they perform better for less $$$ (I've had the 6450 for $59, and it sucks compared to the $50 GT 430). Also, I reccommend you get a MODULAR 600 Watt+ PSU, because it will help with cable management and expandability in the future.

I've had a better experience NVidia cards, as they perform better for less $$$ (I've had the 6450 for $59, and it sucks compared to the $50 GT 430). Also, I reccommend you get a MODULAR 600 Watt+ PSU, because it will help with cable management and expandability in the future.

It varies per price point, but as a rule of thumb... AMD gets higher framerates but nVidia has more stable drivers. Performance depends more on how the program is coded than how powerful the GPU actually is.